Symptoms sound to me not so much like a defective power supply as a power supply that's just marginal for your new system's needs. I'm guessing it's an off-brand supply which came with your case.(?)
First, I'd avoid buying a new case/power supply combo. For one thing, unless you spend rather more money than I'm guessing you want to, you'll end up with another no-name power supply of questionable quality. For another, unless there's some specific deficiency in your case you want to remedy, it's just not worth the risks involved in performing a superfluous motherboard transplant.
As for the new power supply itself, there is absolutely no need for these gratuitous 680 watt bohemoths people keep trying to push on you. *flat stare* Your system as specced is about a frugal as a modern system can be. Assuming your processor is an E2140 (which is actually a Core 2 Duo, not a Pentium IV; a very different animal) you're drawing no more than 200 watts. For comparison and sanity check, my UPS estimates that my heavily-overclocked 3.15GHz Core 2 Duo, Geforce 8800 GTS, 4 hard drives, inefficient power supply, dual LCD monitors , and who-knows-what additional dongles and doohickies combined consume at most 350 watts. And besides that, solid 700 watt power supplies start at around $120. Anything cheaper will achieve combustion before it manages to scrounge up the "rated" wattage.
My recommendation: go for a 380 watt power supply from a solid manufacturer. You'll pay a bit more for the wattage, but it's cheaper than hot flaming death, and it'll give you room for reasonable growth. (Note: 3GHz+ quad core and SLI 8800 GTX's do not constitute "reasonable")
Were I buying right now, I'd say the Antec earthwatts EA380 would be my personal choice. Relatively pricey at $60, but it's 80%+ efficient, which will cut down the power consumption, and its an Antec, which means it's rock-solid, and is likely capable of exceeding its rated wattage.
If I just wanted something cheap, but solid, I'd probably go with the majority opinion on Newegg and grab this 430 watt ThermalTake. $40 out-the-door, minus $12 mail-in rebate *shudder*, for a grand total of $28 for a highly-rated power supply which (judging by reviews) outsells any other power supply on Newegg three-to-one. Probably not as solid as the Antec, and the efficiency is a cheerfully wretched >=65%, but you can feel reasonably confident that it'll work as advertised.
First, I'd avoid buying a new case/power supply combo. For one thing, unless you spend rather more money than I'm guessing you want to, you'll end up with another no-name power supply of questionable quality. For another, unless there's some specific deficiency in your case you want to remedy, it's just not worth the risks involved in performing a superfluous motherboard transplant.
As for the new power supply itself, there is absolutely no need for these gratuitous 680 watt bohemoths people keep trying to push on you. *flat stare* Your system as specced is about a frugal as a modern system can be. Assuming your processor is an E2140 (which is actually a Core 2 Duo, not a Pentium IV; a very different animal) you're drawing no more than 200 watts. For comparison and sanity check, my UPS estimates that my heavily-overclocked 3.15GHz Core 2 Duo, Geforce 8800 GTS, 4 hard drives, inefficient power supply, dual LCD monitors , and who-knows-what additional dongles and doohickies combined consume at most 350 watts. And besides that, solid 700 watt power supplies start at around $120. Anything cheaper will achieve combustion before it manages to scrounge up the "rated" wattage.
My recommendation: go for a 380 watt power supply from a solid manufacturer. You'll pay a bit more for the wattage, but it's cheaper than hot flaming death, and it'll give you room for reasonable growth. (Note: 3GHz+ quad core and SLI 8800 GTX's do not constitute "reasonable")
Were I buying right now, I'd say the Antec earthwatts EA380 would be my personal choice. Relatively pricey at $60, but it's 80%+ efficient, which will cut down the power consumption, and its an Antec, which means it's rock-solid, and is likely capable of exceeding its rated wattage.
If I just wanted something cheap, but solid, I'd probably go with the majority opinion on Newegg and grab this 430 watt ThermalTake. $40 out-the-door, minus $12 mail-in rebate *shudder*, for a grand total of $28 for a highly-rated power supply which (judging by reviews) outsells any other power supply on Newegg three-to-one. Probably not as solid as the Antec, and the efficiency is a cheerfully wretched >=65%, but you can feel reasonably confident that it'll work as advertised.